[Kea-users] what does ach dhcpv4 hook point/parameter mean ?

[Darren Ankney]

Hi,

I am not a developer, but I do know (loosely) what events these refer to:

* lease4_recover (Kea has removed the lease from the lease database
(post expire or release) things like lease affinity affect when this
happens)
* lease4_release (client sent a DHCPRELEASE packet)
* lease4_decline (client sent a DHCPDECLINE packet)

Thank you,
Darren Ankney

On Thu, Aug 8, 2024 at 3:55 AM luckydog xf <luckydogxf at gmail.com> wrote:
>
> Actually I have tested  lease4_expire,  leases4_committed and  lease4_renew already. They're easy to verify.
> But the rest ones, I don't understand which scenarios can call them.
> Thanks.
>
> On Thu, Aug 8, 2024 at 3:52 PM luckydog xf <luckydogxf at gmail.com> wrote:
>>
>> Thanks for your reply.
>> Actually, I have read that docs already. However, I'm still puzzled. I'm going to add and remove DNS records against Samba with kea-dhcp hook points, which is the same as DDNS.
>>
>> Here is the skeleton of my  bash script. Not sure if the action for each hook point is right or not.
>> While add_record and delete_record are public functions.
>> ---
>> # hook points
>> case "$1" in
>>
>>         lease4_renew|lease4_recover )
>>
>>         # Do nothing
>>                 echo $1
>>                 exit 0
>>         ;;
>>
>>         leases4_committed)
>>
>>                 echo $1
>>                 delete_record
>>                 add_record
>>         ;;
>>
>>         lease4_expire |lease4_release) #|lease4_decline)
>>                 echo $1
>>
>>                 delete_record
>>         ;;
>>
>>         *)
>>                 echo "Unhandled function call ${*}"
>>                 exit 123
>>         ;;
>> esac
>>
>>
>> On Thu, Aug 8, 2024 at 3:38 PM Francis Dupont <fdupont at isc.org> wrote:
>>>
>>> luckydog xf writes:
>>> >  I'm running External Hook Scripts now. From
>>> > https://kea.readthedocs.io/en/kea-2.6.0/arm/hooks.html there are the
>>> > following hook points.
>>>
>>> => the right documentation for writing hooks is not the ARM but
>>> the developer guide and its Hook Developer's Guide section
>>> https://reports.kea.isc.org/dev_guide/df/d46/hooksdgDevelopersGuide.html
>>>
>>> If you can't find all answers to your questions please come back to
>>> this mailing list.
>>>
>>> BTW names as LEASES4_AT0_HOSTNAME are about a particular hook library
>>> running shell scripts described in its own section of the ARM
>>> (Run Script Support for External Hook Scripts) which in fact just
>>> exposes parameters which can be read from some callout points.
>>>
>>> Regards
>>>
>>> Francis Dupont <fdupont at isc.org>
>
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